From: Andrew Dunstan <andrew@dunslane.net>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Fix multiple bugs in astreamer pipeline code.
Date: Sun, 29 Mar 2026 13:15:48 +0000
Message-ID: <E1w6pzX-001zl4-1i@gemulon.postgresql.org> (raw)
Fix multiple bugs in astreamer pipeline code.
astreamer_tar_parser_content() sent the wrong data pointer when
forwarding MEMBER_TRAILER padding to the next streamer. After
astreamer_buffer_until() buffers the padding bytes, the 'data'
pointer has been advanced past them, but the code passed 'data'
instead of bbs_buffer.data. This caused the downstream consumer
to receive bytes from after the padding rather than the padding
itself, and could read past the end of the input buffer.
astreamer_gzip_decompressor_content() only checked for
Z_STREAM_ERROR from inflate(), silently ignoring Z_DATA_ERROR
(corrupted data) and Z_MEM_ERROR (out of memory). Fix by
treating any return other than Z_OK, Z_STREAM_END, and
Z_BUF_ERROR as fatal.
astreamer_gzip_decompressor_free() missed calling inflateEnd() to
release zlib's internal decompression state.
astreamer_tar_parser_free() neglected to pfree() the streamer
struct itself, leaking it.
astreamer_extractor_content() did not check the return value of
fclose() when closing an extracted file. A deferred write error
(e.g., disk full on buffered I/O) would be silently lost.
Discussion: https://postgr.es/m/results/98c6b630-acbb-44a7-97fa-1692ce2b827c@dunslane.net
Reviewed-By: Tom Lane <tgl@sss.pgh.pa.us>
Backpatch-through: 15
Branch
------
REL_15_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/d3bb7841b4be7e7aad0bd666117c022acb5a2c64
Modified Files
--------------
src/bin/pg_basebackup/bbstreamer_file.c | 4 +++-
src/bin/pg_basebackup/bbstreamer_gzip.c | 10 ++++++++--
src/bin/pg_basebackup/bbstreamer_tar.c | 4 +++-
3 files changed, 14 insertions(+), 4 deletions(-)
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To: pgsql-committers@postgresql.org
Cc: andrew@dunslane.net, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Fix multiple bugs in astreamer pipeline code.
In-Reply-To: <E1w6pzX-001zl4-1i@gemulon.postgresql.org>
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